Rockwell 24K Handheld Electronic Calculator

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This handheld electronic calculator has a metal case and twenty-five rectangular plastic keys. These include ten digit keys, a decimal point key, four arithmetic function keys, a total key, a % key, a change sign key, an exchange key, a square root key, and four memory keys. The on/off switch is left of the top row of keys. At the bottom of the keyboard a mark reads: the 24K. A mark below this reads: Rockwell. Above the keyboard is an eight-digit blue fluorescent display. The jack for a power adapter is along the front edge.
A metal sticker that should be attached to the back reads: Rockwell (/) International (/) Model 24K (/) Made in Taiwan (/) Republic of China. It also reads: Microelectronics Product Division (/) Anaheim, CA 92803 Ser. No. (/) 101127.105.
The calculator fits in a black wallet about the size of a checkbook. The wallet also contains a leaflet entitled: Rockwell Electronic Calculators Owner’s Manual for the 24K. It appears to date from 1975.
Compare the Rockwell 24K II (1986.0988.164).
[Advertisement], Chicago Tribune, December 4, 1975, p. A6. Rockwell 24K advertised as selling for $40.00.
[Advertisement], Los Angeles Times, February 15, 1976, p. A12. Rockwell 24K advertised as selling for $40.00.
Currently not on view
date made
Rockwell International
place made
Physical Description
metal (case; circuitry material)
plastic (keys; wallet material)
paper (leaflet material)
overall: 1/2 in x 2 3/4 in x 5 5/8 in; 1.27 cm x 6.985 cm x 14.2875 cm
ID Number
catalog number
accession number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History


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